Q73.Marks: +2.0UGC NET Paper 2: Computer Science 7th Dec 2023 Shift 2
Match List-I with List-II
List I
List II
A.
Monoalphabetic Cipher
I.
Round key
B.
DES
II.
One-to-many relationship
C.
Stream Cipher
III.
One-to-one relationship
D.
Polyalphabetic Cipher
IV.
Feedback mechanism
Choose the correct answer from the options given below :
1.A - III, B - I, C - IV, D - II✓ Correct
2.A - III, B - IV, C - II, D - I
3.A - I, B - III, C - IV, D - II
4.A - II, B - I, C - IV, D - III
Solution
The correct answer is A - III, B - I, C - IV, D - II
EXPLANATION:
A. Monoalphabetic Cipher - III. One-to-one relationship
Monoalphabetic ciphers involve a one-to-one mapping of each plaintext letter to a corresponding ciphertext letter.
B. DES (Data Encryption Standard) - I. Round key
DES uses round keys in its encryption and decryption process.
C. Stream Cipher - IV. Feedback mechanism
Stream ciphers often use a feedback mechanism to generate a stream of key bits.
D. Polyalphabetic Cipher - II. One-to-many relationship
Polyalphabetic ciphers involve a one-to-many relationship between plaintext and ciphertext, as each plaintext letter can be encrypted to multiple ciphertext letters depending on the key.
So, the correct match is:A - III, B - I, C - IV, D - II